荷电颗粒可压缩性颗粒层模型  

A Model for a Compressible Particle Layer of Charged Particles

作　　者：黄斌[1] 姚强[1] 龙正伟[1] 宋蔷[1] 

机构地区：[1]清华大学热能动力工程与热科学教育部重点实验室,北京100084

出　　处：《热能动力工程》2007年第4期427-430,共4页Journal of Engineering for Thermal Energy and Power

基　　金：国家"973"基金资助项目(2002CB211600)

摘　　要：研究发现荷电颗粒有趋向于沉积在颗粒链尖端的趋势,据此在已建立的中和可压缩性颗粒层模型中加入荷电颗粒的沉积性质,建立了荷电颗粒可压缩性颗粒层模型,从而研究滤料过滤过程中的颗粒层过滤阶段的机理。通过模型发现,不可压缩时,荷电颗粒形成的颗粒层的高度与中和颗粒层相似,但空隙分布均匀;由于下滑角较小,其不易被压缩,当压降增大到一定程度时,呈周期性压缩,所以在较高过滤风速下其压降显著低于中和工况。模型结果成功地解释了实验现象。Authors' research has shown that charged particles tend to deposit at the tip of particle chains.On this basis,by adding the deposition properties of charged particles to an already established model of a neutralized compressible particle layer,a model for a compressible particle layer of charged particles was set up.Studied thereupon is the mechanism of the filtration stage of the particle layer during the filtration process of filtering materials.It has been found through the model that in case of incompressiblity,the height of the particle layer formed by charged particles is similar to that of the neutralized particle layer.The distribution of voids,however,is uniform.Owing to the glide angle being relatively small,it is not easy for the above-mentioned layer to be compressed.When the pressure drop is increased to a certain value,the said layer assumes a periodic compression.Therefore,its pressure drop at a relatively high filtering air speed is notably lower than that at the neutralized working conditions.The results obtained from the model can successfully explain the experimental phenomena.

关 键 词：荷电颗粒 颗粒层 压缩 压降 空隙率 

分 类 号：X701.2[环境科学与工程—环境工程]